THE MŁAWA SYENITE ALKALINE INTRUSION – A PERSPECTIVE OF RARE EARTH ELEMENTS OCCURRENCE

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THE MŁAWA SYENITE ALKALINE INTRUSION – A PERSPECTIVE OF RARE EARTH ELEMENTS OCCURRENCE

Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2012, Vol 448, Issue 448

Abstract

A number of alkaline and alkaline-ultramafic bodies have been known within the hidden basement of the East European Craton (EEC) in north-western Poland for a long time. These are the strong anomalies of Ełk, Pisz, Tajno and Mława identified based on a geophysical survey. Syenite and quartz syenites, were drilled by only four deep boreholes on the periphery of the Mława anomaly (Płońsk IG 2A/2, Ciechanów 1, Konopki Wielkie and Gradzanowo 2). The REE- and Zr-rich Mława metaluminous syenites are relatively late-stage products of fractionation processes. Electron microprobe analyses confirm primary-appearing REE-fluorocarbonate (bastnäsite–parisite) and zircon abundance as major host phases to REE and Zr in the syenites. A significant concentration of the REE-bearing minerals shows a genetic and spatial relation to an alkaline rocks, therefore the Mława igneous bodies should be the subject of further investigations.

Authors and Affiliations

Ewa KRZEMIŃSKA, Leszek KRZEMIŃSKI

Keywords

ZMIENNOŚĆ WARUNKÓW HYDROGEOCHEMICZNYCH W STREFIE AERACJI HAŁDY KOPALNI RUD SIARCZKOWYCH W MIEDZIANCE (SUDETY ZACHODNIE)

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EP ID EP64394
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